Each of the four series of Heroes are currently going for $8.99 apiece as part of Amazon's ongoing flood of sale prices. That's less than $36 for the lot, which means mere cents per episode. Much better price than the current $109.99 for the four season box.
Use these links to get at the $8.99 prices: season one, season two, season three and season four.
If I actually likedHeroesat all I'd be all over this, but I never did get on with it. All four seasons are region free.